A fluid flow control device can include an inlet port and an outlet port. The fluid flow control device can also include a rotatable component for rotating about an axis in response to fluid flow from the inlet port. A float component positioned within the rotatable component can move between (i) an open position that enables fluid flow from the inlet port to the outlet port, and (ii) a closed position that restricts fluid flow from the inlet port to the outlet port. The float component can move from the open position to the closed position in response to a fluid from the inlet port having one density. The float component can move from the closed position to the open position in response to the fluid from the inlet port having another density.

A vent valve includes an outer frame, a ventilation box movable in the outer frame, a sealing cover, a buoyant box and elongate sliding members. The ventilation box has an interior space. The sealing cover has a cover opening, and closes/opens a surrounding space defined by the ventilation box and the outer frame. The buoyant box is disposed within the interior space. When the buoyant box abuts the sealing cover and closes the cover opening, the cover opening is disconnected from the interior space. When the buoyant box moves away from the sealing cover, the interior space communicates the cover opening. The sliding members slidingly contact the outer frame and ventilation box to guide sliding movements.

A one piece vent formed from one integral piece of material, such as Aluminum, and which defines a fluid pathway therethrough having a borehole within said fluid pathway, and further including a groove that retains a roto clip therein so as to secure a ball and a float within an interior of the vent, the float movable between a sealing position on said borehole and an unsealed position away from said borehole.

A one piece vent formed from one integral piece of material, such as Aluminum, and which defines a fluid pathway therethrough having a borehole within said fluid pathway, and further including a groove that retains a roto clip therein so as to secure a ball and a float within an interior of the vent, the float movable between a sealing position on said borehole and an unsealed position away from said borehole.

Apparatuses, systems, and methods are disclosed for fluid flow control. A container is shaped to receive a liquid. An inlet is configured to allow the liquid to enter the container. An outlet is configured to allow the liquid to exit the container. A float is disposed within the container. A valve is actuated based on a position of the float within the container to open the valve at a first liquid level within the container and to close the valve at a different liquid level within the container.

Apparatuses, systems, and methods are disclosed for fluid flow control. A container is shaped to receive a liquid. An inlet is configured to allow the liquid to enter the container. An outlet is configured to allow the liquid to exit the container. A float is disposed within the container. A valve is actuated based on a position of the float within the container to open the valve at a first liquid level within the container and to close the valve at a different liquid level within the container.

A fluid control system to control fluid flow within a drainage system is disclosed that includes a cage configured to couple an interior wall of a structure of the drainage system, wherein the cage at least partially surrounds an aperture of the interior wall, and a float device configured to be encapsulated within the cage, wherein while in a resting state, the float device at least partially covers an aperture of the structure of the drainage system. In some instances, when fluid contacts the float device at a flow rate of at least a flow threshold, the float device is configured to at least partially uncover the aperture of the interior wall, or further uncover the aperture of the interior wall. The float device may be formed from a buoyant material and configured to rise from the resting state in accordance with a rising fluid level within the structure.

A fluid control system to control fluid flow within a drainage system is disclosed that includes a cage configured to couple an interior wall of a structure of the drainage system, wherein the cage at least partially surrounds an aperture of the interior wall, and a float device configured to be encapsulated within the cage, wherein while in a resting state, the float device at least partially covers an aperture of the structure of the drainage system. In some instances, when fluid contacts the float device at a flow rate of at least a flow threshold, the float device is configured to at least partially uncover the aperture of the interior wall, or further uncover the aperture of the interior wall. The float device may be formed from a buoyant material and configured to rise from the resting state in accordance with a rising fluid level within the structure.

A submersible fluid pump suitable for use in a landfill well includes an outer case extending along a vertical axis and at least partially defining an interior of the fluid pump, a fluid inlet and outlet, a discharge tube within the outer case and disposed between the fluid inlet and the fluid outlet, a float positioned around the discharge tube and within the outer case such that the float is within the discharge tube and the outer case, the float being movable along the discharge tube in an axial direction, a pneumatic valve configured to introduce pressurized air into the interior of the fluid pump, an actuator configured to open and close the pneumatic valve, and a plurality of magnets comprising a first magnet fixed with respect to the actuator and a second magnet fixed with respect to the float, the second magnet configured to magnetically repel the first magnet as the float moves to tip the actuator to either open or close the pneumatic valve.

A submersible fluid pump suitable for use in a landfill well includes an outer case extending along a vertical axis and at least partially defining an interior of the fluid pump, a fluid inlet and outlet, a discharge tube within the outer case and disposed between the fluid inlet and the fluid outlet, a float positioned around the discharge tube and within the outer case such that the float is within the discharge tube and the outer case, the float being movable along the discharge tube in an axial direction, a pneumatic valve configured to introduce pressurized air into the interior of the fluid pump, an actuator configured to open and close the pneumatic valve, and a plurality of magnets comprising a first magnet fixed with respect to the actuator and a second magnet fixed with respect to the float, the second magnet configured to magnetically repel the first magnet as the float moves to tip the actuator to either open or close the pneumatic valve.